| Unit Name: | No. 539 Squadron RAF |
| Dates: | 2 Sep 1942 – 25 Jan 1943 |
| Branch: | Royal Air Force |
| Role: | Turbinlite nightfighter squadron |
| Command Structure: | No. 13 Group RAF, Fighter Command[1] |
| Commander1: | S/Ldr. J.S. Morton, DFC |
| Commander1 Label: | Commanding Officer |
| Identification Symbol Label: | Squadron Badge heraldry |
| Identification Symbol 2 Label: | Squadron Codes |
No. 539 Squadron RAF was one of the ten Turbinlite nightfighter squadrons of the Royal Air Force during the Second World War.
No. 539 Squadron was formed at RAF Acklington, Northumberland on 2 September 1942, from No. 1460 (Turbinlite) Flight, as part of No. 13 Group RAF in Fighter Command. Instead of operating only Turbinlite and -rudimentary- Airborne Intercept (AI) radar equipped aircraft (Havocs and Bostons) and working together with a normal nightfighter unit, the unit now also flew with their own Hawker Hurricanes. It was disbanded at Acklington on 25 January 1943, when Turbinlite squadrons were, due to lack of success on their part and the rapid development of AI radar, thought to be superfluous.
| 2 September 1942 | 25 January 1943 | Mk.I (Turbinlite) | ||
| 2 September 1942 | 25 January 1943 | Douglas Havoc | Mk.II (Turbinlite) | |
| 2 September 1942 | 25 January 1943 | Mk.III (Turbinlite) | ||
| 2 September 1942 | 25 January 1943 | Douglas Boston | Mk.I (Nightfighter) | |
| 2 September 1942 | 25 January 1943 | Hawker Hurricane | Mk.IIc |
| 2 September 1942 | 25 January 1943 | RAF Acklington, Northumberland |